Fixed table crash bug when updating row > 16M (Bug #2159)

myisam/mi_dynrec.c:
  Fixed table crash bug when updating row > 16M

1 files changed, 30 insertions, 0 deletions

diff --git a/mysql-test/t/myisam-blob.test b/mysql-test/t/myisam-blob.test
new file mode 100644
index 00000000000..d58222ec8bf
--- /dev/null
+++ b/mysql-test/t/myisam-blob.test
@@ -0,0 +1,30 @@
+#
+# Test bugs in the MyISAM code with blobs
+#
+
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+# Bug #2159 (Problem with update of blob to > 16M)
+
+CREATE TABLE t1 (data LONGBLOB) ENGINE=myisam;
+INSERT INTO t1 (data) VALUES (NULL);
+UPDATE t1 set data=repeat('a',18*1024*1024);
+select length(data) from t1;
+delete from t1 where left(data,1)='a';
+check table t1;
+truncate table t1;
+INSERT INTO t1 (data) VALUES (repeat('a',1*1024*1024));
+INSERT INTO t1 (data) VALUES (repeat('b',16*1024*1024-1024));
+delete from t1 where left(data,1)='b';
+check table t1;
+
+# now we have two blocks in the table, first is a 1M record and second is
+# a 16M delete block.
+
+UPDATE t1 set data=repeat('c',17*1024*1024);
+check table t1;
+delete from t1 where left(data,1)='c';
+check table t1;
+drop table t1;